Technical deep dives
Paul Martin on props, motors, etc.
Stator laminations: Without super thin stator lams, efficiency suffers at high RPMs. Since thin stator lams are expensive, cheap motors (e.g. Freerchobby) use 0.35mm lams. Eddy losses in the iron stator core induced by the magnetic field switching as the rotor magnets fly past are proportional to the square of the lamination thickness x the square of the rpm. This explains why motors with thick stator lams generate excessive heat without going any faster. One notable exception is the inexpensive Turnigy Rotomax 150 which uses 0.2mm lams.
Paul Martin’s documentation
4th root equation
Dr. Raynor’s equation
Static thrust and horsepower
Kv(v) = RPM
max kw - (.30) = max continuous power
Motor efficiency: Used power - heat. Heat is P=i squared * amps (resistance squared times amps)
Prop pitch recommendation (for cruise?) based on RPM, airspeed, and prop length. You can also view the tables
Mejzlik calculators for disk loading, dynamic thrust, static thrust
Entire power train
Best climb angle and speed